mutable.py 文件源码

def coerce(cls, index, value):

        if not isinstance(value, cls):

            if isinstance(value, Iterable):
                result = cls()

                # noinspection PyTypeChecker
                for i in value:
                    item = cls.__item_type__.coerce(index, i)
                    # item.set_parent(result)
                    result.append(item)
                return result

            return super().coerce(index, value)

        else:
            return value